Your right that's NOT a Manta, about the only things in common are, built of aluminium, has a sail and 3 wheels (but different type from the Manta's).
But I do admire the welding.... VERY nice

I saw it at superior a couple of times at the Nord Nationals it's mostly wood, theoretically FISlY class 5. If Nord didn't build it he would remember the story.
Mantas are assembled with hang glider fittings, not welded.

Hey DudeVato....I went out to Superior Dry lake (near Barstow, Ca, USA) last weekend and got the full scoop!
It was called a Duster. It and several more were built by Nord Design (Nord Embroden) maybe 1980s? The frames are pretty much the same, but different owners have modified the wooden seat structure. Nord teaches welding, so many of his designs involve very nicely welded aluminum frames.
There was a smaller version built for teaching kids; it has an un-battened, boomless rig that roller furls around the mast and the same steering pedals and front end. I'll post some pictures when I get my car unpacked.
BTW those look like the original rear tires 8 in "smooth implement" right?
Blake